WJA Electron Audio
WJA Electron Audio
Audio Power-amp
Audio Power-amp
Power-amp design
6C45PI input & 2A3-40 output valves providing 2 stage SET
No electrolytics in the main circuit or HT power supply (just in DC supply for input heaters)
Constant current source fed VR tubes for input stage
Constant Current Source anode load 6C45PI input stage
Constant current supply for 6C45PI filaments.
D3a input as option. (higher gain)
Performance
About 6 to 7 Watts a channel.
Design modelling using LTSpice running on Ubuntu & WINE
UPDATE: Replaced AC heaters on 2A3-40s with the famous Rod Coleman heater supply. Money well spent! No hum at all. Only 700µV (yes microvolts) of ripple on my loudspeaker terminals.
Power-amp design
6C45PI input & 2A3-40 output valves providing 2 stage SET
No electrolytics in the main circuit or HT power supply (just in DC supply for input heaters)
Constant current source fed VR tubes for input stage
Constant Current Source anode load 6C45PI input stage
Constant current supply for 6C45PI filaments.
D3a input as option. (higher gain)
Performance
About 6 to 7 Watts a channel.
Design modelling using LTSpice running on Ubuntu & WINE
UPDATE: Replaced AC heaters on 2A3-40s with the famous Rod Coleman heater supply. Money well spent! No hum at all. Only 700µV (yes microvolts) of ripple on my loudspeaker terminals.
Contact
WJA Electron S.A.R.L.
216 Route du Mas de Soulié
46230 Cremps, France
International VAT Number: FR08503863136
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